Please explain the following 21st question with reason.

Dear Student,Drift velocity is also a kind of velocity whose SI unit is m/s.Resistivity, ρ=RAlSI unit of resistivity is ohm metre.Potential Gradient =potenial droplengthSI unit of Potential Gradient is V/mmobility =drift velocityelectric field SI unit of mobility is m/secVm=m2 V-1s-1So option b is correctRegards

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